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The Preliminary Study on Rare-Earth Oxides Leaching Rate of the Different Tea Brewing Process

WANG Jin,ZOU Xin-wu,ZHOU Wei-long,ZHENG Guo-jian(China National Center of Quality Supervision and Inspection of Tea,Hangzhou 310016,China)  
Determination the rare earth content in tea by ICP-AES,and analysis of the leaching rate through several brewing.Results showed that rare earth in tea can be extracted with varying degrees by brewing.The relationship between third brewing leaching rate and content of rare earth in original tea is not obvious.The leaching rate of rare earth from tea is between 13%~26%,and the Gongfu black tea is 25.42%,the lowest is Qiantang-longjin and puer tea,there are 13.89% and 13.59% respectively.And with the increase in the number brewing,rare earth leaching rates were reduced by most of tea except Jijian tea and Tieguanyin tea.
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